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gentro89gentro891
"Stasiun Luar Angkasa Tiangong" China saat ini terbang di orbit ketinggian 400 kilometer mie, dengan kecepatan 7,68 kilometer per detik, dan hanya membutuhkan waktu 90 menit untuk mengelilingi bumi. Ketiga astronot harus melalui 16 matahari terbit dan terbenam setiap hari. # popularize science
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